Compilare: user.cpp: In function ‘int main()’: user.cpp:28:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] nr[c]++; ^ user.cpp:32:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size(); i++) ~~^~~~~~~~~~ user.cpp:64:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] nr[c]++; ^ user.cpp:69:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size(); i++) ~~^~~~~~~~~~ user.cpp:73:48: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (s.size() - i - nrb[i] == nr[bad] && s[i] != bad) ^ user.cpp:73:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (s.size() - i - nrb[i] == nr[bad] && s[i] != bad) ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~ user.cpp:76:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] nr[bad]--; ^ user.cpp:15:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("laundering.in", "r", stdin); ^ user.cpp:16:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("laundering.out", "w", stdout); ^